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9-4t=-3t

We move all terms to the left:

9-4t-(-3t)=0

We get rid of parentheses

-4t+3t+9=0

We add all the numbers together, and all the variables

-1t+9=0

We move all terms containing t to the left, all other terms to the right

-t=-9

t=-9/-1

t=+9

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